arm_mat_trans_q15.c

00001 /* ----------------------------------------------------------------------  
00002 * Copyright (C) 2010 ARM Limited. All rights reserved.  
00003 *  
00004 * $Date:        29. November 2010  
00005 * $Revision:    V1.0.3  
00006 *  
00007 * Project:      CMSIS DSP Library  
00008 * Title:        arm_mat_trans_q15.c  
00009 *  
00010 * Description:  Q15 matrix transpose.  
00011 *  
00012 * Target Processor: Cortex-M4/Cortex-M3
00013 *  
00014 * Version 1.0.3 2010/11/29 
00015 *    Re-organized the CMSIS folders and updated documentation.  
00016 *   
00017 * Version 1.0.2 2010/11/11  
00018 *    Documentation updated.   
00019 *  
00020 * Version 1.0.1 2010/10/05   
00021 *    Production release and review comments incorporated.  
00022 *  
00023 * Version 1.0.0 2010/09/20   
00024 *    Production release and review comments incorporated.  
00025 *  
00026 * Version 0.0.5  2010/04/26   
00027 *    incorporated review comments and updated with latest CMSIS layer  
00028 *  
00029 * Version 0.0.3  2010/03/10   
00030 *    Initial version  
00031 * -------------------------------------------------------------------- */ 
00032  
00033 #include "arm_math.h" 
00034  
00035 /**  
00036  * @ingroup groupMatrix  
00037  */ 
00038  
00039 /**  
00040  * @addtogroup MatrixTrans  
00041  * @{  
00042  */ 
00043  
00044 /*  
00045  * @brief Q15 matrix transpose.  
00046  * @param[in]  *pSrc points to the input matrix  
00047  * @param[out] *pDst points to the output matrix  
00048  * @return  The function returns either  <code>ARM_MATH_SIZE_MISMATCH</code>  
00049  * or <code>ARM_MATH_SUCCESS</code> based on the outcome of size checking.  
00050  */ 
00051  
00052 arm_status arm_mat_trans_q15( 
00053   const arm_matrix_instance_q15 * pSrc, 
00054   arm_matrix_instance_q15 * pDst) 
00055 { 
00056   q15_t *pSrcA = pSrc->pData;                    /* input data matrix pointer */ 
00057   q15_t *pOut = pDst->pData;                     /* output data matrix pointer */ 
00058 //  q15_t *pDst = pDst->pData;                     /* output data matrix pointer */  
00059   uint16_t nRows = pSrc->numRows;                /* number of nRows */ 
00060   uint16_t nColumns = pSrc->numCols;             /* number of nColumns */ 
00061   uint16_t col, row = nRows, i = 0u;             /* row and column loop counters */ 
00062   q31_t in;                                      /* variable to hold temporary output  */ 
00063   arm_status status;                             /* status of matrix transpose */ 
00064  
00065  
00066 #ifdef ARM_MATH_MATRIX_CHECK 
00067   /* Check for matrix mismatch condition */ 
00068   if((pSrc->numRows != pDst->numCols) || (pSrc->numCols != pDst->numRows)) 
00069   { 
00070     /* Set status as ARM_MATH_SIZE_MISMATCH */ 
00071     status = ARM_MATH_SIZE_MISMATCH; 
00072   } 
00073   else 
00074 #endif 
00075   { 
00076     /* Matrix transpose by exchanging the rows with columns */ 
00077     /* row loop     */ 
00078     do 
00079     { 
00080       /* Apply loop unrolling and exchange the columns with row elements */ 
00081       col = nColumns >> 2u; 
00082  
00083       /* The pointer pOut is set to starting address of the column being processed */ 
00084       pOut = pDst->pData + i; 
00085  
00086       /* First part of the processing with loop unrolling.  Compute 4 outputs at a time.  
00087        ** a second loop below computes the remaining 1 to 3 samples. */ 
00088       while(col > 0u) 
00089       { 
00090         /* Read two elements from the row */ 
00091         in = *__SIMD32(pSrcA)++; 
00092  
00093         /* Unpack and store one element in the destination */ 
00094         *pOut = (q15_t) in; 
00095  
00096         /* Update the pointer pOut to point to the next row of the transposed matrix */ 
00097         pOut += nRows; 
00098  
00099         /* Unpack and store the second element in the destination */ 
00100         *pOut = (q15_t) ((in & (q31_t) 0xffff0000) >> 16); 
00101  
00102         /* Update the pointer pOut to point to the next row of the transposed matrix */ 
00103         pOut += nRows; 
00104  
00105         /* Read two elements from the row */ 
00106         in = *__SIMD32(pSrcA)++; 
00107  
00108         /* Unpack and store one element in the destination */ 
00109         *pOut = (q15_t) in; 
00110  
00111         /* Update the pointer pOut to point to the next row of the transposed matrix */ 
00112         pOut += nRows; 
00113  
00114         /* Unpack and store the second element in the destination */ 
00115         *pOut = (q15_t) ((in & (q31_t) 0xffff0000) >> 16); 
00116  
00117         /* Update the pointer pOut to point to the next row of the transposed matrix */ 
00118         pOut += nRows; 
00119  
00120         /* Decrement the column loop counter */ 
00121         col--; 
00122       } 
00123  
00124       /* Perform matrix transpose for last 3 samples here. */ 
00125       col = nColumns % 0x4u; 
00126  
00127       while(col > 0u) 
00128       { 
00129         /* Read and store the input element in the destination */ 
00130         *pOut = *pSrcA++; 
00131  
00132         /* Update the pointer pOut to point to the next row of the transposed matrix */ 
00133         pOut += nRows; 
00134  
00135         /* Decrement the column loop counter */ 
00136         col--; 
00137       } 
00138  
00139       i++; 
00140  
00141       /* Decrement the row loop counter */ 
00142       row--; 
00143  
00144     } while(row > 0u); 
00145  
00146     /* set status as ARM_MATH_SUCCESS */ 
00147     status = ARM_MATH_SUCCESS; 
00148   } 
00149   /* Return to application */ 
00150   return (status); 
00151 } 
00152  
00153 /**  
00154  * @} end of MatrixTrans group  
00155  */